Method and device for the optimized circulation of rods in the production of a seamlessly hot-fabricated steel pipe according to the continuous pipe method

摘要

A device for the optimized circulation of mandrels includes a presentation and/or cooling table for mandrel rods, a lubricating station for the mandrel rods, optionally an additional drying station for the lubricant applied to the mandrels, and associated roller conveyors. An additional secondary rod circulation of is arranged upstream of the standard rod circulation and includes two redundantly operating transfer tables connected to the presentation and/or cooling table by a third roller conveyor or the first roller conveyor for the discharge of no longer needed rods from the standard rod circulation. The third roller conveyor either forms the continuation of the first roller conveyor or is arranged parallel thereto with an offset. A fourth roller conveyor for accommodating mandrel rods or passing mandrel rods intermittently into the standard circulation via an intermediate buffer is arranged on the opposite side of the transfer tables parallel to the first roller conveyor.

主权项

1. A method for optimized circulation of mandrel rods during production of a seamless hot-fabricated steel pipe according to the continuous pipe method, comprising the steps of:
arranging a standard rod circulation upstream of a multi-frame continuous rolling mill for supplying, removing and reprocessing of the mandrel rods, providing, when a dimension is changed, at least a required number of mandrel rods with identical diameter for rolling a single dimension, and with the standard rod circulation performing the steps of: (a) applying a lubricant on a mandrel rod and drying the lubricant on the mandrel rod, (b) conveying the mandrel rod into a hollow block, rolling the hollow block and stripping a shell from the mandrel rod, (c) returning the used hot mandrel rod to a cooling or presentation table, (d) cooling the mandrel rod on the cooling table, and (e) when reusing the mandrel rod, transferring the cooled, but still warm mandrel rod to a supply roller conveyor for lubrication, and repeating steps (a) through (e),
arranging a second circulation in form of a secondary rod circulation upstream of the standard rod circulation, thereby enabling changing from one mandrel rod set with a first diameter to mandrel rods with at least one second diameter; when a change in dimensions is impending, instead of providing mandrel rods with the at least one second diameter on the presentation table of the standard rod circulation, placing the mandrel rods having the at least one second diameter on at least two redundantly operating transfer tables of the secondary circulation, removing the mandrel rods having the at least one second diameter from the at least two redundantly operating transfer tables, and inserting the removed mandrel rods, which immediately follow the mandrel rod set with the first diameter, in the standard rod circulation, removing the mandrel rods with the first diameter that are no longer required from the standard rod circulation, and storing or returning the no longer required mandrel rods to the standard rod circulation via one of the at least two transfer tables.